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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aac84416270469ae00dadb64b87380bd42d45e73e819ccf81c74b7e831a9adec' 
  AND token = '8rccH7DyoiwUEYOS6ae+BtFEKfOMaRva/516g9hoA4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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