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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5383e53b10810ba80b1b5759595ee21990fc3393d52e99d61e39d459fa39142a' 
  AND token = 'nBwlW9k2oOGgR/EyD2xlA/QdqjcWthS2lrAQcoGCUuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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