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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27f2752a5dba6891d18ca01b9afd4aec1c0a573ebc8970239f3128d6ecf9b4bc' 
  AND token = 'j015At9g2Wk637zPjCYucVY7+tKMURq5XpfbUsC7P08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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