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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de0787f0d4ad2b8b8a2e0d8b529062bc88c8f58905d16f05990f47952b110bfc' 
  AND token = 'gLoeF0pq4FO0yIwMADdBvD1Y36jganHWM9iJK5nCh6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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