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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '561dd4e60f0a5c1ab70d91b6e9c658d22b7aab4a72d10b8c6a50c75a10e199f4' 
  AND token = 'FTX7evPXTKHX7lAdnJWB1k6Z75P/4c8AaXJBeDXLASs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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