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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd6bac02927acbebffc2429750ea3f35c7325c73c062f90180dee492c6d120d4' 
  AND token = '5A6tBQFIx6u3kO3eciP6hPJuK74A90otmcrSAJS52Os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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