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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7658b070f14e5bba07a9a2385a204525ccc5d0081e3b5b3b179dbd911256ba44' 
  AND token = '04gJLRdiNlZvqzVWo9Luj1MZR6RVKyvdT0DxF1nKxHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}