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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75189e814373381c1251e25ff8bb5158f100d4951739049ae1e5c3ab89ff8d2c' 
  AND token = '5GLf+hNDeVLKpeWQDTE3evQ8BOkI5V72LVEoDV+5WbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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