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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb7b861c8d362aab5cfc7d909d204bccdd5b34c44618806c6329f3436d160e35' 
  AND token = 'yAut8uHWWEZd3PeVpAIvbadUnOky4OtqXMQSaguH9p0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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