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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8469d9e3ee1feeaa1e0d57200c4ddbf0b8873b2af78361e4a2448450b6186d3' 
  AND token = 'VLwLQ9774y6VX4mSCux0NFzutWJfYL4cELwcRY4hkDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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