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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd962c4af430e33659d16eda44a097aff7d8f62f512be68c4c54850200aaa7b0f' 
  AND token = 'FehFnsAXqSdecj1l7jpynv60QVMJLCQCWah+fsyVAr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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