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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c98f18750d9a1065566c305e518ffce95230ff32ac53806ea63666853e3cb9c' 
  AND token = 'Q9WEQvUOUfCCP2B7Ef9OhiRyxdjGm+vl2EujXhFGZRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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