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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55d0cab894bad83baf7bf3666790f4c56e786913d8dbb23bdeec78cc30546cce' 
  AND token = 'LbW/zz9DlQ5IrULnf0s20+SUjitV9fz6uaAC7N2mGU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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