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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f84bed5a99099482c51954a46be2654de69efebf6b16906abf312d7bbf3ad97' 
  AND token = 'QZz/nEEt1Gi2zrQS1iQupmNVUzu4xuXXhgAaRs6vV3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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