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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21289161a4ae70dfab118e80ee1bc477e5626ede33226d9ff0cb3c0692323098' 
  AND token = 'EbM2EaIDKy0ZxFaoFpnWiHlTfwA4n8L3A96mTDgurJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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