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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa4883a5ad5a2808a99841291ab886747fd7a4704f04805074a60e6c39369529' 
  AND token = 'qdO5g6Lu4Fj99VjOcTxtkaRCyGNVCBc+4bZVaQ46yGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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