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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8336d18f5065a338449a5de1f2e1c73ddd8568b301aa41a3264e85deefe5ec87' 
  AND token = 'AnQHAoZ/JVf0+sPTsQkmM9fhFYD8Zgw6jPQgWMkll2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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