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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db37b8cf0e188de828b3faf25fbd90a4f4a3277724a630afa3424f9f876f028b' 
  AND token = '+C9k1DKBOzeP/mp47yXa0zU+FGqOjyDy0kyliOIol2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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