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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2e61f57183608eccfb30f692ac5083c8a9ab0a8e41bc77926337dd0f3307cd8' 
  AND token = '7TuD+UcXu31KWBgO1AekO8AXFChGjiBKKg3LInsvLas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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