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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a81118d8c731e892fb5c3b59c6d2cc1843d0dfcc87d91e3749bf4b5fd1dabb0' 
  AND token = 'LLifPG83d06OpoTZ84GZHetitfk1jpkI+5VweYNVDYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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