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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1fcab77731e29fe97339631486f2685b97a14840a08034d3513997cf407bb55' 
  AND token = 'pI82eycr9j4Cv2OZz1n9+x9g9E4FR8bRcCksuxl5qDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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