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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32ea11a3901e6837d2e95dcaf0344efd3b897ccfd171bdac10ca6d285f624a83' 
  AND token = '9BG8HqORYBOCY6qOSRhyiPQp7aP0gv0a84szIQc++9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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