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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '838406a919e5d2157f0f1e2c40a6c33cc720c84b1dc4d1775515fd6cc5f20e26' 
  AND token = 'bOYs8APVP+QS6cNt/HTtpRFpYxHYgKeq1ishJNprSKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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