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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf0e7ac5a1c9e5f14f247d8475ba3d47f319963e6249e4f7b85a968cd37ae898' 
  AND token = 'ilTd7eyHhBX29fwkp4AIke1BK4YIjCOnd+pbR97VNbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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