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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec82d5b4ef5c684c576565c2206e6ee6ba9a52b83fbd53ccac9d5975edcf5fa8' 
  AND token = '6PVW15c6cf34qrgla69Uu/YvFUDS59HyS1jcOzI0bL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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