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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd2f35cf943e05ff86992097f1bacfd7df5b2daf35e90a31c22e1b59aeb9fcd8' 
  AND token = 'BZSDoOoqIz7xI6xd5VO/QmUvNqRO4Kc1VsdCxA0PqK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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