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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cc4203bdf726b47c1daa319f6b47ccb1ba54677ec1423c630e7618af834f6c9' 
  AND token = 'V/x0habYmrzE8WSnBcCORbxIWWFD2ND6LkoChGKaWy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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