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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a7be93d33961f0e20778a38c1afc8e43e88d97826bf3682c90da6ade3d98788' 
  AND token = 'kKwK1i9+ZERebXVZKZ88jnHWl/H0GwiWRgbEkfLVjjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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