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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01124348e0580b2818e9281875e1c9b3fcf786643858bf68089811308d3c8bcb' 
  AND token = '9Ku0jb8PcvX40+34pRTbH9rNR1BkwPLA+DyTqV7psP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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