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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f96f9bbdc09aab7038fc035614c69ba22e570495b61a458837d11bab5f9dcb49' 
  AND token = 'mABoa7UOX2EL1/d+AZmV6Wh9ULhY/MI4eDanE/eFRkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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