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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '736ce0bbaa225c2cb39047405b61f85f691f1fbf8f8bffce281c4603b72af54d' 
  AND token = 'HMD3CFUX40Sy5A6UgHKdeMM77kIYX68u3/9gTwS5zqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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