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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1369bf44a158d92d17f117e24dfdd1da7e2e08177ae1173ad9415989d30c1e12' 
  AND token = 'l1vvmi9f1m/kKdnYvXZdJgXS7GpYwDaN/mXdV754a6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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