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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee8e87fb1820a3918c3cf41a07bed03dcd941e7fb4d41a9b570025ebcc95cda5' 
  AND token = 'b6EuFUp9rBbUQSvA54XEFacLBFvsJR9BmwAPD+M+HaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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