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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0a91c6e9dc1c413e1766efbd6850ab6e5f5f4b5a4b2565f10b77d38e9728bea' 
  AND token = 'wFlApw3RuTAjoHqc4fc8gMQuT4egcj6yGSBIgMn7yQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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