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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93ed260969a634c6d37f421ccf514662bf07d90af8580348e7f4bb63d06c3e89' 
  AND token = 'bgXT/L6ezFu1q3aup6aiT6j0piHCGSo83TgxV+WCt2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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