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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44a1565393b6125cf6e110f6d4bdb9ec74a5171188b7a7898601479de45e8465' 
  AND token = 'S1Te5i2GOli56N35ccdpWCAi6C72d0/0L1YL+zsdvo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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