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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71beca926120e71cee8ec5b824103fcd10bd5cf4bd26c5d4616fd89081bb62a6' 
  AND token = 'SXiyJcmxCEx5vzTaj2ZjzZ7x8Kv5HUO+rH9uhSia4Kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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