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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ab2fc21e60c73639643742dfb11e007380e7759275940c054cff780d70e8e3b' 
  AND token = 'h+O0iMUtendkRWxrpE9AVUC4wD83k9og+gIPQh2XTLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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