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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '723be5668e910f54f93150ddb32984ae00bfc4dc35270964776d5e6c8e565b13' 
  AND token = 'pSdBnFEc5We2Qi7d/LvdAaDhLceA/F5GtF6XsMrrOYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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