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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '240b60ce1fbb4bda61e578618e0e81ca8ff371640e15fbc89080b98f1c7eee80' 
  AND token = 'd1JxWXNpXgSq3FaXJoJQoyDbQSt84Jx52Z5/u0NG7hA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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