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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9c802e6ff3edc4210abe94e4dcb53c1c081804fb90059a3ac82a682aebcdf8c' 
  AND token = 'nQ+eAOKZoHOYgjUcvZVOnd23DRbzt+eYY3JW+RZq3Xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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