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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '596e56559558a967b609570f85ecc09f27b8a5390c509ce43f9019a2dea89079' 
  AND token = 'wKcSgOwIYgiqdFO0mddNpG8xqN/wdFWhZ3CLkc12rmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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