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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '943111aea9e0a3ff7422292193eb85ef905c6d2045881c574d826a91d98a02e7' 
  AND token = 'P5Urg88P8PLHuOE7aCTIQ9sufoSWf5QJgcVCwj8Qd4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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