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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '690c867ce1ac320d5d63d47b6af13d27a6b843b64688844ed6f9e4c32405b468' 
  AND token = 'yu1eK3KuVRJJOmhXOGUOZMlu20o2syLrtiUy8ehMEf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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