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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0597c28f0c36e29e548b7bd020f3b861aeb5924244fb25791c40d0578b7559bf' 
  AND token = 'c29iXqn3aN5L4q9sa+CXiUr8bY16H/3cY6aqfFIk068=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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