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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41441d40ac8655f568c237667562ec4c0d545fe9ad6297728d592ae3bc6fc89c' 
  AND token = 'mQoPHKFx/m7zh5Es50PUPfASQbgXpT+HzlaUn2m2+Nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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