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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7315f7c40f5ac1c613f40d17603118ed8e0b591e3b0ec7b8ecc155fb9b79c3fa' 
  AND token = 'g5jLr57YUgdMKe3w2AfIdR8xt2LmMQKr49qGpFKh/yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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